2 Corinthians 9:6-8

6 Remember this: he who sows sparingly will also reap sparingly. He who sows bountifully will also reap bountifully.  7 Let each man give according as he has determined in his heart; not grudgingly, or under compulsion; for God loves a cheerful giver.  8 And God is able to make all grace abound to you, that you, always having all sufficiency in everything, may abound to every good work.